DDD: SO tag. An Entity or value type?

Question

In the context of Domain Driven Design, is a StackOverflow tag (ie. ffffd ) a value object or entity?

EDIT:

Imagine, that you have to build SO website. How wou

Answer 1

Just some additional considerations: Tags can be normalized, "DDD" should be equal to "ffffd" and "DdD", and in most tag systems, spaces get replaced with "_" underscores. Also I guess the creator will be tracked for the badge system.